Improvement in pulleys



2 Sheets-Sheet 1.

W. A. WALES.

PULLEY.

Patented Ju1y11,1876.

l N.179,74e.

I'll

Bbl

INVENTOR Wam.

WITNESSES .Attorney 2 Sheets-Shet 2.

W. A. WALES. PULLEY.

Patented July 11, 1876.

fmfeno 7*.- MOM QM A WJ@- #my mf m WILLIAM A. WALES, OF JERSEY CITY,

vPACLENr OFFICE.

NEW JERSEY, ASSIGNOR TO GEORGE E. LINCOLN, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT ll\l PULLEYS.

v Specification forming part of Letters Patent No. 179,746, dated July 11, `1876 application filed June 2, 1876.

To all whom it may concern:

Be it known that I, WILLIAM A. WALES, of

Jersey City, in the county of Hudson and.

State of New Jersey, have invented certain new and useful Improvements in Pulleys; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

The object of my invention is to provide means for increasing and decreasing the speed of mechanisms operated through the agency of pulleys without the use of countershafting or nests of pulleys. In carrying out this object l have invented a new grooved pulley,

which is extensible in itself, to afford a lesser or greater circumferential bearin g for the belting, as the speed is to be increased or diminished. This pulley consists of two concentric conical frustums, having their sides of alternate lingers and slots, said frustums being arranged upon a shaft with their truncated portions opposite each other, so that, as they approach, the fingers of one cone enter the slots of the other-the closer the contact the greater circumferential bearing for the belting, and vice versa. The cones `are operated to approach and recede by suitable devices. 4I have hereinafter fully set forth the operation of my extensible pulley, and its use in connection with a lathe, and illustrated in the accom panying drawings, in which- Y Figure l represents a plan view of the pul- Ieys, and their operating devices. Fig. 2 is a side elevation of the same. Fig. 3 is a plan view of the pulleys, showing a modification of the operating devices. Fig. 4 is a vertical longitudinal section of the same. Fig. 5 represents the application ofmy invention to a lathe, showing the connection between the power transmitted from the main shaft through the pulleys to the lathe.

When my extensible pulley is used, as shown in the drawings, A A will refer to the disks or conical frustums, secured on the shafts B B in any suitable manner, These disks have in their sides alternate slots c and fingers d. Engaging with the disks A A are the disks C C', on which are formed grooved hubs or collars D. The disks C C are operated to advance and recede by means of semicircular yokes E, which engage and partially fit in the grooves of collars D D, and-are joined by the lever-arm F fulcrumed at its center on an upright standard, G, fixed to the stand supporting or carrying the uprights, on which are journaled the pulley-shafts. EX- tending from and fastened to the arm is a lever, H, at the outer end of which is formed a handle used to move the lever backward and forward. The lever H is supported on and clamped to a plate, I, said plate having in it a segmental slot, e, through which, from the under side, passes the screw-threaded portion of a thumb-screw, K, and then enters the female threads of the lever at f. When p it becomes necessaryv to change or alter the speed of the pulley, the operator catches the handle of the lever with one hand, using the other hand to move the clamping thumb-screw that holds t-he lever in the desired position, and moves it to the right or left, causing the semieircular yoke on one end of the arm to push the lingers of its conical frustum C or C', as the ease may be, into the slots of its engaging frustum, thereby making the circumferential bearing for the belting larger, while at the same time the other semicircular yoke is pulling` its frustum from its engagingdisk, causing its diameter to become smaller, thereby making the circumferential grooved bearing-surface of one pulley larger and the other smaller, thus causing the speed to be increased or diminished at the pleasure of the operator.

When my extensible pulley is used, as shown in the modification in the drawings, Sheet 2, Figs. 3, 4, and 5, A A will refer to the disks or conical frustums secured on the shaft-B by means of the set-screws a.V These disks have their sides of alternate slots c and tingersd. Engaging with the disks AA are the disks C C', joined together and operated by means of the sleeve or collar D. This collar D is provided with a circular rack, lt, whichV L fulcrumed at q. The leverl or switch L, which is operated from its outer end, can be held in any position at or on 'the segmental indicating-disk or slotted semicircular yoke Y. When it becomes necessary to change or alter the speed of the pulleys, the operator catches the lever at its outer end, Which projects to- Ward him, with one hand, using the other hand to move the clamping-screw that holds the lever in the desired position, and movesit to the right or left, causing the pinion to operate the cogged sleeve carrying the slotted engaging-disks, thereby making the fingers of one disk to enter the slots of the other at one end of the shaft, While at the other end they are receding or leaving each other, thereby making the circumferential grooved bearing of one pulley larger and the other smaller, thus causing the speed to be increased or diminished at the pleasure of the operator.

I do not Wish to confine myself to any par ticular method of operating the extensible pulleys, since my invention consists especially in the extensible pulley itself', carrying, of- 

